This is more of a word of caution as opposed to a guide:
Upon loading the game for the first time, you will be asked to allow PC Building Simulator to have various permissions (a large message should pop up prior to accessing the main menu). If you decline to grant those permissions, this achievement (as well as "Wow to build a PC!") seemingly won't unlock until the permissions are granted, or they wouldn't for me. After deleting my cloud save and granting the permissions, I completed the mode again and unlocked the achievements immediately.
I'm not certain if other (all?) achievements are affected by not granting permissions.
Provided you have no issues with the above, this will stack with "Wow to build a PC!" should you beat the time requirement.